Ignore all the retards who are trying to police the Internet.
Chat with your teammates. Go with the same rifles/system that they have. Same mags, batteries, chargers, etc... That way you can help each other out with spare mags, batts, repair parts, gun-doc'ing. That's what teammates are for, right?
G&P are nice, so are King Arms. Classic Army's are ok. VFC's are really nicely built. They all need a good once over for reliability. Ask your teammates for help.
Avoid the Systema Revolution mechboxes.
BUT...if it were me. I'd get 2 PTWs. One shorter CQB sized and one carbine sized.
1. Different setups for different things
2. they're essentially "hot-swappable" if you blow the circuits or toast a cylinder.
I have no idea how much stuff costs down where you are...so set a budget and work with that. If your team is tight with the sponsor (assuming an airsoft shop)...maybe they'll let you plunk down a chunk now and pay the balance off on in installments. Dunno.